//---------------------------------------------------------------------------
//	Greenplum Database
//	Copyright (C) 2010 Greenplum, Inc.
//
//	@filename:
//		CParseHandlerAgg.h
//
//	@doc:
//		SAX parse handler class for parsing aggregate operator nodes.
//---------------------------------------------------------------------------

#ifndef GPDXL_CParseHandlerGroupBy_H
#define GPDXL_CParseHandlerGroupBy_H

#include "gpos/base.h"
#include "naucrates/dxl/parser/CParseHandlerPhysicalOp.h"

#include "naucrates/dxl/operators/CDXLPhysicalAgg.h"

namespace gpdxl
{
	using namespace gpos;

	XERCES_CPP_NAMESPACE_USE
	
	//---------------------------------------------------------------------------
	//	@class:
	//		CParseHandlerAgg
	//
	//	@doc:
	//		Parse handler for aggregate operators
	//
	//---------------------------------------------------------------------------
	class CParseHandlerAgg : public CParseHandlerPhysicalOp
	{
		private:
						
			// the aggregate operator
			CDXLPhysicalAgg *m_dxl_op;
			
			// private copy ctor
			CParseHandlerAgg(const CParseHandlerAgg &);
			
			// process the start of an element
			void StartElement
				(
				const XMLCh* const element_uri, 		// URI of element's namespace
				const XMLCh* const element_local_name,	// local part of element's name
				const XMLCh* const element_qname,		// element's qname
				const Attributes& attr				// element's attributes
				);
				
			// process the end of an element
			void EndElement
				(
				const XMLCh* const element_uri, 		// URI of element's namespace
				const XMLCh* const element_local_name,	// local part of element's name
				const XMLCh* const element_qname		// element's qname
				);
	
		public:
			// ctor/dtor
			CParseHandlerAgg
				(
				CMemoryPool *mp,
				CParseHandlerManager *parse_handler_mgr,
				CParseHandlerBase *parse_handler_root
				);						
	};
}

#endif // !GPDXL_CParseHandlerGroupBy_H

// EOF
